/* =====================================================
   LINUS SEAH — Personal Site
   Typography inspired by kohweijie.com (Tufte CSS / ET Book)
   Earthy neutral palette
   ===================================================== */

/* ── Web Fonts ──
   Crimson Pro: closest freely-available match to ET Book (old-style serif)
   Source Sans 3: clean humanist sans matching Gill Sans spirit            */
@import url('https://fonts.googleapis.com/css2?family=Crimson+Pro:ital,wght@0,400;0,500;0,600;1,400;1,500&family=Source+Sans+3:wght@400;500;600&display=swap');

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Earthy palette */
  --text:        #2c2c2c;
  --text-light:  #6b6b60;
  --text-muted:  #9a9588;
  --accent:      #8b7355;
  --accent-hover:#6d5a43;
  --bg:          #faf9f6;
  --bg-alt:      #f2f0eb;
  --border:      #e0ddd5;
  --tag-bg:      #ece9e1;
  --tag-text:    #5c5647;
  --code-bg:     #f5f3ee;
  --highlight:   #c4a97d;

  /* Layout */
  --max-width: 680px;

  /* Fonts */
  --font-sans:  'Source Sans 3', 'Gill Sans', 'Gill Sans MT', Calibri, sans-serif;
  --font-serif: 'Crimson Pro', 'Palatino Linotype', Palatino, 'Book Antiqua', Georgia, serif;
  --font-mono:  Consolas, 'Liberation Mono', Menlo, Courier, monospace;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Layout ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Navigation ── */
nav {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
  font-family: var(--font-sans);
}

nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-name {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-name:hover { color: var(--accent); }

.nav-photo {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  display: block;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--text-light);
  text-decoration: none;
  transition: color 0.15s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}

/* ── Page Header ── */
.page-header {
  margin-bottom: 12px;
}

.page-header h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 400;
  line-height: 1.25;
  margin-bottom: 0;
  color: var(--text);
}

.page-header .subtitle {
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--text-light);
  line-height: 1.65;
  margin-top: 10px;
}

/* ── Home Page ── */
.home-intro {
  padding: 4px 0 32px;
}

.home-intro h1 {
  font-family: var(--font-serif);
  font-size: 1.9rem;
  font-weight: 400;
  margin-bottom: 16px;
  line-height: 1.3;
}

.home-intro p {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--text-light);
  line-height: 1.75;
  margin-bottom: 16px;
  max-width: 560px;
}

.home-intro .links {
  margin-top: 20px;
  display: flex;
  gap: 18px;
  align-items: center;
}

.home-intro .links a {
  color: var(--text-light);
  text-decoration: none;
  display: flex;
  align-items: center;
  transition: color 0.15s;
}

.home-intro .links a:hover { color: var(--accent); }

.cv-link {
  display: inline-block;
  margin-top: 16px;
  margin-bottom: 12px;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--accent);
  text-decoration: none;
}

.cv-link:hover { text-decoration: underline; }

/* ── Section Headings ── */
.section-heading {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* ── Card List (Projects, Articles) ── */
.card-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.card {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}

.card:last-child { border-bottom: none; }

.card-title {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.card-title a {
  color: var(--text);
  text-decoration: none;
}

.card-title a:hover { color: var(--accent); }

.card-meta {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
  letter-spacing: 0.01em;
}

.card-desc {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.65;
}

.card-tags {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 11px;
  color: var(--tag-text);
  background: var(--tag-bg);
  border: 1px solid var(--border);
  padding: 2px 10px;
  border-radius: 12px;
  letter-spacing: 0.02em;
}

/* ── Blog Post Layout ── */
.post-header {
  margin-bottom: 28px;
}

.post-header .series {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 10px;
}

.post-header h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 400;
  line-height: 1.25;
  margin-bottom: 12px;
  color: var(--text);
}

.post-header .post-subtitle {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--text-light);
  font-style: italic;
  line-height: 1.6;
  margin-bottom: 12px;
}

.post-header .post-meta {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-muted);
}

.post-header .post-meta a {
  color: var(--accent);
  text-decoration: none;
}

/* ── Prose (Blog Post Body) ── */
.prose {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  line-height: 1.85;
  color: var(--text);
}

.prose p { margin-bottom: 1.4rem; }

.prose h2 {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 400;
  font-style: italic;
  color: var(--text);
  margin: 52px 0 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.prose h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 400;
  font-style: italic;
  color: var(--text-light);
  margin: 36px 0 12px;
}

.prose a { color: var(--accent); text-decoration: none; }
.prose a:hover { text-decoration: underline; }

.prose strong { color: var(--text); font-weight: 600; }

.prose code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--text-light);
}

.prose pre {
  background: #2a2520;
  color: #e8e0d4;
  padding: 20px 24px;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.65;
  margin: 28px 0;
}

.prose pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.prose .code-source {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-muted);
  margin-top: -20px;
  margin-bottom: 28px;
}

.prose .code-source a { color: var(--accent); font-size: 12px; }

.prose img {
  max-width: 100%;
  border-radius: 6px;
  border: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.prose .figure {
  margin: 40px 0;
  text-align: center;
}

.prose .caption {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 10px;
  font-style: italic;
  line-height: 1.5;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-family: var(--font-sans);
  font-size: 14px;
}

.prose th {
  background: var(--bg-alt);
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--border);
  color: var(--text);
  letter-spacing: 0.02em;
}

.prose td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--bg-alt);
  vertical-align: top;
  color: var(--text-light);
}

/* ── Callout Boxes ── */
.callout {
  background: var(--bg-alt);
  border-left: 3px solid var(--accent);
  padding: 18px 22px;
  margin: 36px 0;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-style: italic;
  color: var(--text-light);
  border-radius: 0 6px 6px 0;
}

.callout strong { color: var(--text); font-style: normal; }

.insight-box {
  background: #f4f0e8;
  border: 1px solid #d9cebe;
  border-radius: 6px;
  padding: 18px 22px;
  margin: 36px 0;
  font-family: var(--font-sans);
  font-size: 15px;
}

.insight-box .label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 8px;
}

.warning-box {
  background: #f5ede0;
  border: 1px solid #ddc9aa;
  border-radius: 6px;
  padding: 18px 22px;
  margin: 36px 0;
  font-family: var(--font-sans);
  font-size: 15px;
}

.warning-box .label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #8b5e35;
  margin-bottom: 8px;
}

.cost-highlight {
  background: #f2ede5;
  border: 1px solid var(--highlight);
  border-radius: 6px;
  padding: 16px 20px;
  margin: 28px 0;
  text-align: center;
  font-family: var(--font-sans);
}

.cost-highlight .amount {
  font-size: 30px;
  font-weight: 600;
  color: var(--accent-hover);
}

.cost-highlight .context {
  font-size: 13px;
  color: var(--text-light);
}

/* ── Next Post Teaser ── */
.next-post {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 18px 22px;
  margin: 44px 0;
  font-family: var(--font-sans);
}

.next-post .label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 6px;
}

.next-post .title { font-size: 17px; font-weight: 600; }
.next-post a { color: var(--text); text-decoration: none; }
.next-post a:hover { color: var(--accent); }

/* Bug header for Post 2 */
.prose .bug-header {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: #9b4a2a;
  margin: 28px 0 8px;
}

/* ── Post Footer ── */
.post-footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 2px solid var(--border);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text-light);
}

.post-footer a { color: var(--accent); text-decoration: none; }
.post-footer a:hover { text-decoration: underline; }

/* ── About Page ── */
.about-content {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-light);
}

.about-content p { margin-bottom: 1.2rem; }
.about-content a { color: var(--accent); text-decoration: none; }
.about-content a:hover { text-decoration: underline; }

.about-content h2 {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin: 40px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* ── Footer ── */
footer {
  margin-top: 56px;
  padding: 24px 0;
  border-top: 1px solid var(--border);
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  letter-spacing: 0.03em;
}

footer a { color: var(--text-muted); text-decoration: none; }
footer a:hover { color: var(--text); }

/* ── Responsive ── */
@media (max-width: 600px) {
  .container { padding: 0 16px; }

  nav .container {
    flex-direction: column;
    gap: 12px;
  }

  .nav-links { gap: 20px; }

  .home-intro h1 { font-size: 1.6rem; }

  .page-header h1,
  .post-header h1 { font-size: 1.7rem; }

  .prose { font-size: 1.05rem; }

  .prose h2 { font-size: 1.35rem; }
}